﻿// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Media;
using AvaloniaEdit.Text;

namespace AvaloniaEdit.Rendering
{
    /// <summary>
    /// A inline UIElement in the document.
    /// </summary>
    public class InlineObjectElement : VisualLineElement
    {
        /// <summary>
        /// Gets the inline element that is displayed.
        /// </summary>
        public IControl Element { get; }

        /// <summary>
        /// Creates a new InlineObjectElement.
        /// </summary>
        /// <param name="documentLength">The length of the element in the document. Must be non-negative.</param>
        /// <param name="element">The element to display.</param>
        public InlineObjectElement(int documentLength, IControl element)
            : base(1, documentLength)
        {
            Element = element ?? throw new ArgumentNullException(nameof(element));
        }

        /// <inheritdoc/>
        public override TextRun CreateTextRun(int startVisualColumn, ITextRunConstructionContext context)
        {
            if (context == null)
                throw new ArgumentNullException(nameof(context));

            return new InlineObjectRun(1, TextRunProperties, Element);
        }
    }

    /// <summary>
    /// A text run with an embedded UIElement.
    /// </summary>
    public class InlineObjectRun : TextEmbeddedObject
    {
        internal Size DesiredSize;

        /// <summary>
        /// Creates a new InlineObjectRun instance.
        /// </summary>
        /// <param name="length">The length of the TextRun.</param>
        /// <param name="properties">The <see cref="TextRunProperties"/> to use.</param>
        /// <param name="element">The <see cref="IControl"/> to display.</param>
        public InlineObjectRun(int length, TextRunProperties properties, IControl element)
        {
            if (length <= 0)
                throw new ArgumentOutOfRangeException(nameof(length), length, "Value must be positive");

            Length = length;
            Properties = properties ?? throw new ArgumentNullException(nameof(properties));
            Element = element ?? throw new ArgumentNullException(nameof(element));
        }

        /// <summary>
        /// Gets the element displayed by the InlineObjectRun.
        /// </summary>
        public IControl Element { get; }

        /// <summary>
        /// Gets the VisualLine that contains this object. This property is only available after the object
        /// was added to the text view.
        /// </summary>
        public VisualLine VisualLine { get; internal set; }

        /// <inheritdoc/>
        public override bool HasFixedSize => true;

        /// <inheritdoc/>
        public override StringRange StringRange => default(StringRange);

        /// <inheritdoc/>
        public override int Length { get; }

        /// <inheritdoc/>
        public override TextRunProperties Properties { get; }

        public override Size GetSize(double remainingParagraphWidth)
        {
            if (Element.IsMeasureValid)
            {
                return DesiredSize;
            }

            return Size.Empty;
        }

        public override Rect ComputeBoundingBox()
        {
            if (Element.IsMeasureValid)
            {
                var baseline = DesiredSize.Height;
                return new Rect(DesiredSize);
            }

            return Rect.Empty;
        }

        public override void Draw(DrawingContext drawingContext, Point origin)
        {
        }
    }
}
